STMicroelectronics STEVAL-MKI221V1

Overview

STEVAL-MKI221V1 from STMicroelectronics is an adapter board for the LSM6DSO32X 6-axis IMU, providing full DIL24 socket compatibility, complete pinout access, and pre-mounted decoupling capacitors for immediate evaluation. It enables rapid prototyping of motion-sensing systems in wearables, industrial IoT, and portable electronics.

For engineers reviewing the STEVAL-MKI221V1 datasheet, STEVAL-MKI221V1 pinout, STEVAL-MKI221V1 application, or STEVAL-MKI221V1 equivalent, this board supports direct integration with STEVAL-MKI109D, X-NUCLEO-IKS4A1, and X-NUCLEO-IKS02A1 platforms - critical for MEMS sensor characterization, firmware validation, and system-level timing alignment.

Technical Context

The STEVAL-MKI221V1 is a passive breakout adapter - not an active sensor or controller - designed exclusively to route all 14 signal terminals and 10 power/ground connections of the LSM6DSO32X in a standard DIL24 footprint. It includes dual 100 nF VDD decoupling capacitors and configurable pull-up resistors for SDA, SCL, CS, INT1, INT2, and OCS.

No onboard logic, microcontroller, or voltage regulation is present. Signal integrity is maintained via direct trace routing from LSM6DSO32X pads to DIL24 pins, with no level-shifting, buffering, or signal conditioning - preserving native electrical behavior for accurate sensor evaluation.

Key Specifications

Availability

STEVAL-MKI221V1 is available at Aetrix Electronics and suitable for wearable motion sensing, industrial condition monitoring, and portable device inertial testing requiring stable component supply and fast evaluation-cycle turnaround.

Supply support for STEVAL-MKI221V1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader specializing in MEMS sensors, microcontrollers, power management, and automotive ICs - with over 30 years of motion-sensing innovation.

This board belongs to ST's Professional MEMS Tool family, engineered to accelerate sensor evaluation across development stages - from lab characterization to firmware integration - without custom hardware design.

FAQ

Does STEVAL-MKI221V1 include an onboard microcontroller or firmware?

No. The board contains only passive components: the LSM6DSO32X IMU, two 100 nF decoupling capacitors, and configurable pull-up resistors. All signal processing, communication, and timing control must be handled externally by a host platform such as STEVAL-MKI109D or an STM32 Nucleo board.

Can STEVAL-MKI221V1 operate standalone without connection to another evaluation platform?

No. It lacks power regulation, USB interface, or host processor. It requires external 1.71–3.6 V VDD and VDDIO supplies, plus a master controller (e.g., STEVAL-MKI109D) to drive I²C/SPI and read sensor data - it functions solely as a breakout and signal-routing interface.

What is the purpose of the OCS pin on STEVAL-MKI221V1?

OCS (Output Control Signal) is a dedicated output enable pin for the LSM6DSO32X's embedded sensor hub. On this board, it is routed to DIL24 pin 10 and supports synchronized multi-sensor data acquisition when used with compatible host platforms like STEVAL-MKI109D or X-NUCLEO-IKS4A1.

Is STEVAL-MKI221V1 RoHS compliant and suitable for commercial production prototypes?

Yes. The board is RoHS compliant per STMicroelectronics' DB4455 data brief Rev 2 (March 2025). While intended for evaluation, its DIL24 form factor, verified signal routing, and production-grade passives make it suitable for early-stage functional validation and firmware development in commercial prototype builds.